Samsung LE37A65*A Service Manual page 205

4-1-4. No Video (Tuner_CVBS)
Symptom Audio is normal but no picture is displayed on the screen.
-
Check the Tuner CVBS source
-
Major
Check the SEMT01(MT8226)
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
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Diagnostics
1
2
3
Caution Make sure to disconnect the power before working on the IP board.
Power Indicator is off.
Lamp on, no picure.
Yes
Does the signal appear at C1351?
Yes
[4] Does the signal appear at
pin 9 of TU3101?
Yes
Does the digital data appear at the
output of LVDS (RA5104~RA5109)?
Yes
Check the LVDS cable?
Replace the LCD panel?
3
2
1
No
Connect the RF cable and
check RF signal.
No
Check a B+ voltage (#3 of Tuner) 5V,
change a main PCB ass'y.
Check a TU3101
No
Change a main PCB ass'y.
No
Check a IC5105
Change a main PCB ass'y
No
Please, Contact Tech support.
4. Troubleshooting
4-7